feat(nitrogen): Improve error message for cyclic struct references

[puckey]

• Adds a helpful error message when Nitrogen encounters a stack overflow possibly due to cyclic struct references
• Documents the limitation in the custom-structs docs with examples of direct and indirect cycles
• Links the error message to the docs for more info

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[puckey]

Closing in favor of #1074 which includes this improvement along with proper cyclic dependency handling.